The Snapshot Shuttle (for Snapshot //e card)
A Multi-tasking System for Apple II+ and IIe by Bob Sather (1984 Dark Star Systems)
"The Snapshot Shuttle lets you use several programs at a time without the need to swap disks or reboot. It is the most effective and least expensive method of adding multi-tasking capabilities to your microcomputer."
* Video demonstration of Snapshot Shuttle in action is here:-https://youtu.be/U7hTfkaxYyw